Fast coarse tuning control for PLL frequency synthesizer
US6597249B2 · kind B2 · utility
38Cited by
5References
3Claims
0Family size
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Key dates
| Filing date | Sep 4, 2001 |
| Grant date | Jul 22, 2003 |
| Priority date | — |
| Expiry date | Sep 4, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/199
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The VCO of a synthesizer operates with a coarse tuning and a fine tuning. During the coarse tuning, a binary search method is used to match the VCO frequency to one of a finite number of discrete reference frequencies. The coarse tuning operates without frequency division and phase comparison in a closed feedback loop, thereby speeding up the settling time and increasing the lock-in range. The fine tuning operates as a conventional analog PLL.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.